3V DC from two AA batteries or a rechargeable NiMH pack. Wired / Play & Charge: 5V DC from the USB bus interface. The Voltage Regulation Stage
If you need help identifying specific components on your board layout, tell me:
If you are probing the controller with a multimeter:
The brain of the controller that interprets signals from all inputs and communicates with the console.
Dual 10k-ohm potentiometers that measure X and Y axes.
Always apply rosin-core flux when desoldering the heavy ground pins of the joystick modules.